Update FLIP 237 link

[sisyphusSmiling]

Point FLIP 237 link to contents on main

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For contributor use:

• Targeted PR against main branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.03%. Comparing base (428634e) to head (2acbb11).
Report is 138 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   82.88%   86.03%   +3.15%     
==========================================
  Files          18       18              
  Lines         818      888      +70     
==========================================
+ Hits          678      764      +86     
+ Misses        140      124      -16     

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